DSB Series 45# Steel Single Disc High Rigidity Coupling – 8-Screw, Zero Backlash for Servo/Stepper Motors

Factory direct | 45# steel body | 304 stainless steel disc | 8-screw multilateral arc design | Zero backlash | Black oxide finish | High torsional rigidity | Low inertia | Clamping type | OEM/ODM/OBM

The Apexcoupling DSB series is a high-performance single disc coupling engineered for precision power transmission in servo motor, stepper motor, and general motion control applications. Featuring a 45# steel body with black oxide surface treatment and a 304 stainless steel disc in a multilateral arc shape with eight screws, this coupling delivers exceptional torque capacity, high torsional rigidity, and zero backlash operation. The single disc structure provides strong compensation for radial, angular, and axial misalignment while maintaining compact dimensions. With identical clockwise and counterclockwise rotation characteristics, the DSB series is ideal for high-precision applications requiring anti-vibration, safety, and long service life.

✅ Zero backlash, high rigidity, high sensitivity – commonly used in servo motors and stepper motors.

Key Technical Specifications

🔧 Custom bores, outer diameters, lengths, and keyway options available. Contact us with your specifications.

Product Structure

1. Two 45# Steel Hubs – High-strength carbon steel, precision-machined, black oxide finish.

2. 304 Stainless Steel Disc – Multilateral arc shape with eight screws – improves precision and torque transmission.

3. Eight High-Strength Screws – Secure clamping fastening for reliable torque transmission.

💡 How it works: The single disc coupling consists of two hubs connected by a single stainless steel disc spring. Torque is transmitted through the disc, which flexes to accommodate angular and axial misalignment while maintaining high torsional rigidity. The multilateral arc shape with eight screws enhances precision and torque capacity. This structure is good for anti-vibration, safety, and longer service life.

Product Features & Advantages

Single Disc vs Double Disc – Key Differences

Selection guideline:

• Choose single disc (DSB) when space is limited and high torsional rigidity is required, and shafts are well-aligned with no significant parallel misalignment.

• Choose double disc when parallel misalignment must be accommodated.

⚠️ Important: Single disc couplings cannot accommodate parallel misalignment due to the complex bending that would be required of the lone disc. Take extra care to center the shafts when using single disc types.

Applications

• Servo Motors – High-precision motion control, zero backlash requirement

• Stepper Motors – Accurate positioning, no lost motion

• CNC Machines – Feed drives, spindle positioning

• Factory Automation (FA) – Pick-and-place systems, indexing tables

• Packaging Machinery – Registration and indexing systems

• Printing Equipment – Register control, high-speed operation

• Robotics – Joint drives, precision motion

• Machine Tools – Precision positioning systems

• Textile Machinery – High-speed, precision drives

• Semiconductor Equipment – Clean room compatible, high precision

• Medical Devices – Precision motion systems

Why Choose Apex Coupling for DSB Disc Couplings?

FAQ

Q: What is a single disc coupling?
A: A single disc coupling consists of two hubs connected by a single stainless steel disc spring. It transmits torque through the disc while accommodating angular and axial misalignment.

Q: What is the advantage of the 8-screw multilateral arc design?
A: The multilateral arc shape with eight screws improves precision and torque capacity compared to standard designs. The eight-screw layout can transmit better torque than six-bolt styles.

Q: What materials are used?
A: The hubs are made of 45# carbon steel with black oxide finish. The disc is made of 304 stainless steel.

Q: Does the coupling have backlash?
A: No. The DSB series features zero backlash – no rotational clearance, ensuring precise positioning for servo and stepper motors.

Q: Can single disc couplings accommodate parallel misalignment?
A: No. Single disc couplings cannot accommodate parallel misalignment due to the complex bending required of the lone disc. They are recommended only for space-limited instances with well-aligned shafts.

Q: What misalignment can the coupling compensate for?
A: The single disc structure compensates for radial, angular, and axial deviations.

Q: What are the rotation characteristics?
A: Clockwise and counterclockwise rotation characteristics are exactly the same.

Q: Is the coupling suitable for servo motors?
A: Yes. The DSB series is commonly used in servo motors and stepper motors. Disc couplings are recommended for servo motors due to their zero backlash and high torsional rigidity.

Q: What is the surface treatment?
A: Standard surface treatment is black oxide (blueing/blackening) for corrosion resistance.

Q: Can I get a custom coupling?
A: Yes. We offer OEM, ODM, and OBM support – custom bores, outer diameters, lengths, and keyway options available.

Request a Quote

Send us your bore size, torque, speed, and application details. Our engineers will recommend the optimal model and provide a quotation within 24 hours.